基于数学形态学的振动信号降噪和解调方法研究  

Method of De-noising and Modulation in Vibration Signal Based on Mathematical Morphology

作　　者：朱云博[1,2] 冯广斌 孙华刚 李顺德[2] 

机构地区：[1]军械技术研究所,石家庄050003 [2]军械工程学院,石家庄050003

出　　处：《机械科学与技术》2012年第8期1261-1264,共4页Mechanical Science and Technology for Aerospace Engineering

摘　　要：在齿轮箱的故障诊断中,为同时实现对齿轮故障信号的降噪和解调,依据数学形态学理论,设计了两种不同的形态运算:形态组合运算和形态差值运算。可根据信号处理的不同目的,实现含噪信号的降噪和调制信号的解调。对仿真信号和实测齿轮裂纹故障信号的分析结果表明:形态组合运算可抑制信号中的脉冲及随机噪声,提高信噪比,实现信号的降噪处理;而形态差值运算可提取信号中的调制脉冲,充分突出故障信号的冲击特征。During the fault diagnosis in gearbox, in order to achieve de-noising and demodulation simultaneously in the fault gear vibration signal, two different morphological operators are designed based on the mathematical morphological theory. For different signal processing purpose, the vibration signal can be de-noised and modulated with morphological operators. The procession results of simulated signal and real gear crack fault signal show that the combined operation can filter the impulse and stochastic noises, and improve signal-to-noise ratio, while the difference operation can extract the demodulated impulses in the signal, and reveal impulsion feature in fault signal. The proposed method is simple and fast in computation as only addition and subtraction operators are need. This method can be applied to the singal processing in online diagnosis for gearbox.

关 键 词：故障诊断 降噪 解调 数学形态学 冲击特征 

分 类 号：TH165[机械工程—机械制造及自动化] TN911[电子电信—通信与信息系统]